2026-04-11T11:00:00Z 通常 気象庁本庁 気象庁 2026-04-11T20:00:00+09:00 2026-04-11T21:00:00+09:00 2026-04-12T15:00:00+09:00 350 発表 1 降灰予報 1.1_0 　現在、草津白根山（白根山（湯釜付近））は噴火警戒レベル２（火口周辺規制）です。草津白根山（白根山（湯釜付近））で噴火が発生した場合には、１１日２１時から２４時までは火口から南東方向、１２日０９時から１２時までは火口から南東方向に降灰が予想されます。 降灰予報（定時） 06 草津白根山（白根山（湯釜付近）） 350 降灰 70 栃木県足利市 0920200 群馬県前橋市 1020100 群馬県高崎市 1020200 群馬県桐生市 1020300 群馬県伊勢崎市 1020400 群馬県太田市 1020500 群馬県渋川市 1020800 群馬県藤岡市 1020900 群馬県安中市 1021100 群馬県みどり市 1021200 群馬県榛東村 1034400 群馬県吉岡町 1034500 群馬県中之条町 1042100 群馬県長野原町 1042400 群馬県嬬恋村 1042500 群馬県草津町 1042600 群馬県東吾妻町 1042900 群馬県玉村町 1046400 長野県高山村 2054300 小さな噴石の落下 75 群馬県中之条町 1042100 群馬県嬬恋村 1042500 群馬県草津町 1042600 長野県高山村 2054300 降灰予報（定時） 06 草津白根山（白根山（湯釜付近）） 350 +3638.63+13831.67+2160/ 降灰 70 栃木県足利市 0920200 群馬県前橋市 1020100 群馬県高崎市 1020200 群馬県桐生市 1020300 群馬県伊勢崎市 1020400 群馬県太田市 1020500 群馬県渋川市 1020800 群馬県藤岡市 1020900 群馬県安中市 1021100 群馬県みどり市 1021200 群馬県榛東村 1034400 群馬県吉岡町 1034500 群馬県中之条町 1042100 群馬県長野原町 1042400 群馬県嬬恋村 1042500 群馬県草津町 1042600 群馬県東吾妻町 1042900 群馬県玉村町 1046400 長野県高山村 2054300 小さな噴石の落下 75 群馬県中之条町 1042100 群馬県嬬恋村 1042500 群馬県草津町 1042600 長野県高山村 2054300 2026-04-11T21:00:00+09:00 2026-04-12T00:00:00+09:00 降灰 70 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南東 80 栃木県足利市 0920200 群馬県前橋市 1020100 群馬県高崎市 1020200 群馬県桐生市 1020300 群馬県伊勢崎市 1020400 群馬県太田市 1020500 群馬県渋川市 1020800 群馬県みどり市 1021200 群馬県榛東村 1034400 群馬県吉岡町 1034500 群馬県中之条町 1042100 群馬県長野原町 1042400 群馬県嬬恋村 1042500 群馬県草津町 1042600 群馬県東吾妻町 1042900 長野県高山村 2054300 小さな噴石の落下 75 1 +36.6588+138.5400/+36.6579+138.5600/+36.6548+138.5800/+36.6467+138.6000/+36.6400+138.6145/+36.6200+138.6132/+36.6155+138.6000/+36.6110+138.5800/+36.6108+138.5600/+36.6200+138.5508/+36.6212+138.5400/+36.6400+138.5212/+36.6588+138.5400/ 東 7 群馬県中之条町 1042100 群馬県草津町 1042600 2026-04-12T00:00:00+09:00 2026-04-12T03:00:00+09:00 降灰 70 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南東 70 群馬県前橋市 1020100 群馬県高崎市 1020200 群馬県伊勢崎市 1020400 群馬県太田市 1020500 群馬県渋川市 1020800 群馬県榛東村 1034400 群馬県吉岡町 1034500 群馬県中之条町 1042100 群馬県長野原町 1042400 群馬県嬬恋村 1042500 群馬県草津町 1042600 群馬県東吾妻町 1042900 長野県高山村 2054300 小さな噴石の落下 75 1 +36.6489+138.5200/+36.6588+138.5400/+36.6580+138.5600/+36.6539+138.5800/+36.6476+138.6000/+36.6400+138.6076/+36.6200+138.6160/+36.6106+138.6000/+36.6063+138.5800/+36.6082+138.5600/+36.6200+138.5429/+36.6203+138.5400/+36.6311+138.5200/+36.6400+138.5111/+36.6489+138.5200/ 東 7 群馬県中之条町 1042100 群馬県嬬恋村 1042500 群馬県草津町 1042600 長野県高山村 2054300 2026-04-12T03:00:00+09:00 2026-04-12T06:00:00+09:00 降灰 70 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南東 70 群馬県前橋市 1020100 群馬県高崎市 1020200 群馬県伊勢崎市 1020400 群馬県渋川市 1020800 群馬県藤岡市 1020900 群馬県榛東村 1034400 群馬県吉岡町 1034500 群馬県中之条町 1042100 群馬県長野原町 1042400 群馬県嬬恋村 1042500 群馬県草津町 1042600 群馬県東吾妻町 1042900 群馬県玉村町 1046400 長野県高山村 2054300 小さな噴石の落下 75 1 +36.6588+138.5400/+36.6579+138.5600/+36.6532+138.5800/+36.6400+138.5932/+36.6268+138.6000/+36.6200+138.6114/+36.6052+138.6000/+36.6022+138.5800/+36.6047+138.5600/+36.6059+138.5400/+36.6200+138.5259/+36.6400+138.5206/+36.6588+138.5400/ 南東 7 群馬県中之条町 1042100 群馬県嬬恋村 1042500 群馬県草津町 1042600 2026-04-12T06:00:00+09:00 2026-04-12T09:00:00+09:00 降灰 70 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+36.3026+139.0600/+36.3072+139.0800/+36.3078+139.1000/+36.3036+139.1200/+36.3001+139.1400/+36.3000+139.1403/+36.2999+139.1400/+36.2957+139.1200/+36.2931+139.1000/+36.2965+139.0800/+36.2997+139.0600/+36.3000+139.0594/+36.3026+139.0600/ 南東 70 群馬県高崎市 1020200 群馬県伊勢崎市 1020400 群馬県渋川市 1020800 群馬県藤岡市 1020900 群馬県安中市 1021100 群馬県榛東村 1034400 群馬県吉岡町 1034500 群馬県中之条町 1042100 群馬県長野原町 1042400 群馬県嬬恋村 1042500 群馬県草津町 1042600 群馬県東吾妻町 1042900 群馬県玉村町 1046400 長野県高山村 2054300 小さな噴石の落下 75 1 +36.6588+138.5400/+36.6575+138.5600/+36.6400+138.5774/+36.6308+138.5800/+36.6200+138.5995/+36.6000+138.5893/+36.5983+138.5800/+36.6000+138.5774/+36.6028+138.5600/+36.6039+138.5400/+36.6200+138.5239/+36.6400+138.5212/+36.6588+138.5400/ 南東 7 群馬県中之条町 1042100 群馬県嬬恋村 1042500 群馬県草津町 1042600 2026-04-12T09:00:00+09:00 2026-04-12T12:00:00+09:00 降灰 70 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南東 50 群馬県高崎市 1020200 群馬県渋川市 1020800 群馬県榛東村 1034400 群馬県吉岡町 1034500 群馬県中之条町 1042100 群馬県長野原町 1042400 群馬県嬬恋村 1042500 群馬県草津町 1042600 群馬県東吾妻町 1042900 長野県高山村 2054300 小さな噴石の落下 75 1 +36.6588+138.5400/+36.6562+138.5600/+36.6400+138.5762/+36.6278+138.5800/+36.6200+138.5878/+36.6000+138.5806/+36.5998+138.5800/+36.6000+138.5797/+36.6026+138.5600/+36.6035+138.5400/+36.6200+138.5235/+36.6400+138.5212/+36.6588+138.5400/ 南東 7 群馬県中之条町 1042100 群馬県嬬恋村 1042500 群馬県草津町 1042600 2026-04-12T12:00:00+09:00 2026-04-12T15:00:00+09:00 降灰 70 +36.6596+138.5200/+36.6600+138.5400/+36.6599+138.5600/+36.6400+138.5800/+36.6393+138.6000/+36.6200+138.6193/+36.6197+138.6200/+36.6177+138.6400/+36.6000+138.6580/+36.5996+138.6600/+36.5971+138.6800/+36.5800+138.6988/+36.5797+138.7000/+36.5764+138.7200/+36.5600+138.7383/+36.5593+138.7400/+36.5556+138.7600/+36.5400+138.7775/+36.5389+138.7800/+36.5306+138.8000/+36.5200+138.8131/+36.5177+138.8200/+36.5163+138.8400/+36.5000+138.8588/+36.4986+138.8600/+36.4828+138.8800/+36.4800+138.8824/+36.4675+138.9000/+36.4600+138.9125/+36.4521+138.9200/+36.4400+138.9337/+36.4276+138.9400/+36.4200+138.9455/+36.4074+138.9600/+36.4000+138.9661/+36.3810+138.9600/+36.3800+138.9572/+36.3768+138.9400/+36.3753+138.9200/+36.3800+138.9136/+36.3924+138.9000/+36.4000+138.8934/+36.4051+138.8800/+36.4111+138.8600/+36.4200+138.8423/+36.4203+138.8400/+36.4235+138.8200/+36.4353+138.8000/+36.4400+138.7927/+36.4446+138.7800/+36.4600+138.7671/+36.4746+138.7600/+36.4800+138.7544/+36.4853+138.7400/+36.5000+138.7238/+36.5011+138.7200/+36.5080+138.7000/+36.5200+138.6874/+36.5212+138.6800/+36.5285+138.6600/+36.5400+138.6483/+36.5406+138.6400/+36.5478+138.6200/+36.5600+138.6077/+36.5604+138.6000/+36.5725+138.5800/+36.5800+138.5725/+36.5805+138.5600/+36.6000+138.5405/+36.6001+138.5400/+36.6086+138.5200/+36.6200+138.5086/+36.6400+138.5006/+36.6596+138.5200/ 南東 50 群馬県高崎市 1020200 群馬県渋川市 1020800 群馬県榛東村 1034400 群馬県中之条町 1042100 群馬県長野原町 1042400 群馬県嬬恋村 1042500 群馬県草津町 1042600 群馬県東吾妻町 1042900 長野県高山村 2054300 小さな噴石の落下 75 1 +36.6588+138.5400/+36.6514+138.5600/+36.6400+138.5714/+36.6200+138.5795/+36.6060+138.5600/+36.6065+138.5400/+36.6200+138.5265/+36.6400+138.5212/+36.6588+138.5400/ 南東 4 群馬県中之条町 1042100 群馬県嬬恋村 1042500 群馬県草津町 1042600 　現在、草津白根山（白根山（湯釜付近））は噴火警戒レベル２（火口周辺規制）です。草津白根山（白根山（湯釜付近））で噴火が発生した場合には、１１日２１時から２４時までは火口から南東方向、１２日０９時から１２時までは火口から南東方向に降灰が予想されます。 　１１日２１時から１２日１５時までに噴火が発生した場合には、以下の方向・距離に降灰及び小さな噴石の落下が予想されます。 　 　時刻　　　　　　　　　　　　火口からの方向　降灰の距離　小さな噴石の距離 　１１日２１時から２４時まで　南東　　　　　　８０ｋｍ　　７ｋｍ　　　　　 　１２日００時から０３時まで　南東　　　　　　７０ｋｍ　　７ｋｍ　　　　　 　１２日０３時から０６時まで　南東　　　　　　７０ｋｍ　　７ｋｍ　　　　　 　１２日０６時から０９時まで　南東　　　　　　７０ｋｍ　　７ｋｍ　　　　　 　１２日０９時から１２時まで　南東　　　　　　５０ｋｍ　　７ｋｍ　　　　　 　１２日１２時から１５時まで　南東　　　　　　５０ｋｍ　　４ｋｍ　　　　　 　 　期間中に噴火が発生した場合には、以下の市町村に降灰が予想されます。 　栃木県　：足利市 　群馬県　：前橋市、高崎市、桐生市、伊勢崎市、太田市、渋川市、みどり市、榛東村、吉岡町、 　　　　　中之条町、長野原町、嬬恋村、草津町、東吾妻町、藤岡市、玉村町、安中市 　長野県　：高山村 　 　噴煙が火口縁上１０００ｍまで上がった場合の火山灰及び小さな噴石の落下範囲を示しています。 　噴火発生時、小さな噴石の落下が予想される範囲内では、屋内や頑丈な屋根の下などに移動してください。 　強風のため、遠方まで小さな噴石が流されるおそれがあります。